Description (CNA)
Malcolm is a network traffic analysis tool suite. Prior to version 26.07.0, role-based access control enforced in the Nginx OpenResty Lua layer evaluates the raw, unnormalized `ngx.var.request_uri`, while Nginx itself routes requests using the normalized path. An authenticated low-privilege user can prepend a traversal segment (for example `/x/../upload/...`) so that Nginx routes the request to a restricted backend while the Lua role check fails to match any rule and falls open, granting access it should deny. Version 26.07.0 fixes the issue.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| cisagov / Malcolm | affected < 26.07.0; unaffected 26.07.0 |
CWE
CWE-863
References
- https://github.com/cisagov/Malcolm/security/advisories/GHSA-m5fr-rv3h-xg2r
- https://github.com/cisagov/Malcolm/releases/tag/v26.07.0
- https://www.cisa.gov/news-events/ics-advisories/icsa-26-230-01
- https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-230-01.json
ADP enrichment
No English description supplied.
No references supplied.